Cooling Water System in Volvo Diesel Engine

Cooling Water System in Volvo Diesel Engine

Function

The function of the cooling water system is to transport heat energy away from the engine and accessory components to the radiator. The cooling water system consists of the coolant and the following components:

- Engine and radiator circuit

- Oil cooler circuit

- Charge air cooler circuit, water-to-air

- Expansion tank and venting circuit

The system can be extended with extra circuits:

- Torque converter oil cooler circuit

- Compressor cooler circuit

- Engine heater circuit

- Cabin heater circuit

- Coolant filter circuit

Coolant

From 2011, Volvo Penta will use the new type of coolant,VCS yellow.

The coolant has three functions:

1 To provide sufficient heat transfer.

2 To protect all cooling system metal parts from corrosion.

3 To provide sufficient protection against freezing. We recommend the use of “Volvo Penta Coolant, Ready Mixed” or “Volvo Penta Coolant” (concentrated) mixed with water. This is the only grade of coolant suitable for, and approved by, Volvo Penta. Anti-corrosion additives are not permitted in Volvo Penta engines. Never use water by itself as the coolant.

IMPORTANT! The correct mixture of coolant must be used all year round. This also applies where there is never a risk of freezing, to ensure that the engine has sufficient corrosion protection. Future warranty claims related to engine and accessories may be declined if an unsuitable coolant has been used, or if the recommendation for coolant mixture has not been followed.

Mixture ratio

WARNING!

All coolant is hazardous and harmful to the environment. Do not consume. Coolant is flammable.

IMPORTANT!

Under no circumstances may Volvo Penta coolant VCS, yellow be mixed with any other coolant.

IMPORTANT!

Industrial engines may not use coolant filters in combination with yellow VCS coolant. There filter is therefore not fitted to industrial engines filled with VCS yellow.

Mix:

40 % Volvo Penta glycol (conc. coolant)

60 % water

This mixture protects against internal corrosion, cavitation and damage from freezing down to -28 °C (-18 °F). The freezing point is lowered to -54 °C (-65 °F) with 60 % glycol in the coolant. Never mix more than 60 % concentrate (glycol) in the coolant, as this will impair protection against freezing, impair cooling ability, and result in a risk of overheating.

IMPORTANT!

The coolant must be mixed with clean water. Use distilled, deionized water. The water must comply with Volvo Penta requirements. Refer to Water Quality page 64.

IMPORTANT!

It is very important that the cooling system be filled with coolant of the correct concentration. Mix in a separate clean vessel before filling the cooling system.

Make sure the fluids are well mixed.

Engine and radiator circuit

This circuit comprises the following main components:

- Thermostat (T)

- Coolant pump (WP)

- Water ducts in the engine block and cylinder heads

- A bypass (P) between the thermostat housing and the coolant pump